Any secret places?

Hint 1 of 4:

(1) Jump through the wall in front of the drinking fountain.

Hint 2 of 4:

(2) Close to where the blue keycard was found, there is a button.  Press this
button to temporarily open the door that you can see through the window.

Hint 3 of 4:

Quickly take the elevator down and run through the door.

Hint 4 of 4:

Oh, and be on the watch for the maze of pipes and vents.